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The composition of …………. in air is about 78% by volume. 

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The composition of …………. in air is about 78% by volume. 

(A) CO2 

(B) O2  

(C) N2  

(D) Ar

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2 Answers

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Correct option is : (C) N2

The composition of N2, O2 and CO2 in air are 78%, 21% and 0.03% respectively by volume

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Correct option is (C) N2

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